Finding the Fourth Proportional to 101,152.50, 139,590.45 and 56,440.50

Step by Step Solution

1. Step 1: Write the proportion equation
   101,152.50 : 139,590.45 = 56,440.50 : x
2. Step 2: Convert to fraction form
   101,152.50/139,590.45 = 56,440.50/x
3. Step 3: Cross multiply
   101,152.50x = 139,590.45 × 56,440.50
4. Step 4: Simplify right side
   101,152.50x = 7,878,554,793.23
5. Step 5: Solve for x
   x = 7,878,554,793.23/101,152.50
6. Step 6: Final answer
   x = 77,887.89