Finding the Fourth Proportional to 102,520.72, 141,479.76 and 57,808.72

Step by Step Solution

1. Step 1: Write the proportion equation
   102,520.72 : 141,479.76 = 57,808.72 : x
2. Step 2: Convert to fraction form
   102,520.72/141,479.76 = 57,808.72/x
3. Step 3: Cross multiply
   102,520.72x = 141,479.76 × 57,808.72
4. Step 4: Simplify right side
   102,520.72x = 8,178,763,831.51
5. Step 5: Solve for x
   x = 8,178,763,831.51/102,520.72
6. Step 6: Final answer
   x = 79,776.69