Finding the Fourth Proportional to 129,100.32, 178,014.60 and 83,718.72

Step by Step Solution

1. Step 1: Write the proportion equation
   129,100.32 : 178,014.60 = 83,718.72 : x
2. Step 2: Convert to fraction form
   129,100.32/178,014.60 = 83,718.72/x
3. Step 3: Cross multiply
   129,100.32x = 178,014.60 × 83,718.72
4. Step 4: Simplify right side
   129,100.32x = 14,903,154,453.31
5. Step 5: Solve for x
   x = 14,903,154,453.31/129,100.32
6. Step 6: Final answer
   x = 115,438.56