Finding the Fourth Proportional to 101,024.80, 139,536.72 and 74,128.48

Step by Step Solution

1. Step 1: Write the proportion equation
   101,024.80 : 139,536.72 = 74,128.48 : x
2. Step 2: Convert to fraction form
   101,024.80/139,536.72 = 74,128.48/x
3. Step 3: Cross multiply
   101,024.80x = 139,536.72 × 74,128.48
4. Step 4: Simplify right side
   101,024.80x = 10,343,644,957.79
5. Step 5: Solve for x
   x = 10,343,644,957.79/101,024.80
6. Step 6: Final answer
   x = 102,387.19