Finding the Fourth Proportional to 162,147,339.60, 243,222,584.04 and 129,718,680.72

Step by Step Solution

1. Step 1: Write the proportion equation
   162,147,339.60 : 243,222,584.04 = 129,718,680.72 : x
2. Step 2: Convert to fraction form
   162,147,339.60/243,222,584.04 = 129,718,680.72/x
3. Step 3: Cross multiply
   162,147,339.60x = 243,222,584.04 × 129,718,680.72
4. Step 4: Simplify right side
   162,147,339.60x = 31,550,512,722,978,128
5. Step 5: Solve for x
   x = 31,550,512,722,978,128/162,147,339.60
6. Step 6: Final answer
   x = 194,579,280.80