Finding the Fourth Proportional to 102,111.08, 140,911.78 and 57,398.76

Step by Step Solution

1. Step 1: Write the proportion equation
   102,111.08 : 140,911.78 = 57,398.76 : x
2. Step 2: Convert to fraction form
   102,111.08/140,911.78 = 57,398.76/x
3. Step 3: Cross multiply
   102,111.08x = 140,911.78 × 57,398.76
4. Step 4: Simplify right side
   102,111.08x = 8,088,161,441.39
5. Step 5: Solve for x
   x = 8,088,161,441.39/102,111.08
6. Step 6: Final answer
   x = 79,209.44