Finding the Fourth Proportional to 101,728.77, 140,380.04 and 56,404.10

Step by Step Solution

1. Step 1: Write the proportion equation
   101,728.77 : 140,380.04 = 56,404.10 : x
2. Step 2: Convert to fraction form
   101,728.77/140,380.04 = 56,404.10/x
3. Step 3: Cross multiply
   101,728.77x = 140,380.04 × 56,404.10
4. Step 4: Simplify right side
   101,728.77x = 7,918,009,253.27
5. Step 5: Solve for x
   x = 7,918,009,253.27/101,728.77
6. Step 6: Final answer
   x = 77,834.51