Finding the Fourth Proportional to 101,200.36, 139,654.50 and 56,487.40

Step by Step Solution

1. Step 1: Write the proportion equation
   101,200.36 : 139,654.50 = 56,487.40 : x
2. Step 2: Convert to fraction form
   101,200.36/139,654.50 = 56,487.40/x
3. Step 3: Cross multiply
   101,200.36x = 139,654.50 × 56,487.40
4. Step 4: Simplify right side
   101,200.36x = 7,888,719,603.30
5. Step 5: Solve for x
   x = 7,888,719,603.30/101,200.36
6. Step 6: Final answer
   x = 77,951.50