Finding the Fourth Proportional to 72,641.68, 109,126.56 and 43,078.91

Step by Step Solution

1. Step 1: Write the proportion equation
   72,641.68 : 109,126.56 = 43,078.91 : x
2. Step 2: Convert to fraction form
   72,641.68/109,126.56 = 43,078.91/x
3. Step 3: Cross multiply
   72,641.68x = 109,126.56 × 43,078.91
4. Step 4: Simplify right side
   72,641.68x = 4,701,052,876.34
5. Step 5: Solve for x
   x = 4,701,052,876.34/72,641.68
6. Step 6: Final answer
   x = 64,715.64