Finding the Fourth Proportional to 101,242.50, 139,714.65 and 56,530.50

Step by Step Solution

1. Step 1: Write the proportion equation
   101,242.50 : 139,714.65 = 56,530.50 : x
2. Step 2: Convert to fraction form
   101,242.50/139,714.65 = 56,530.50/x
3. Step 3: Cross multiply
   101,242.50x = 139,714.65 × 56,530.50
4. Step 4: Simplify right side
   101,242.50x = 7,898,139,021.83
5. Step 5: Solve for x
   x = 7,898,139,021.83/101,242.50
6. Step 6: Final answer
   x = 78,012.09