Finding the Fourth Proportional to 102,402.72, 141,311.25 and 57,085.68

Step by Step Solution

1. Step 1: Write the proportion equation
   102,402.72 : 141,311.25 = 57,085.68 : x
2. Step 2: Convert to fraction form
   102,402.72/141,311.25 = 57,085.68/x
3. Step 3: Cross multiply
   102,402.72x = 141,311.25 × 57,085.68
4. Step 4: Simplify right side
   102,402.72x = 8,066,848,797.90
5. Step 5: Solve for x
   x = 8,066,848,797.90/102,402.72
6. Step 6: Final answer
   x = 78,775.73