Finding the Fourth Proportional to 101,405.47, 139,934.04 and 56,080.81

Step by Step Solution

1. Step 1: Write the proportion equation
   101,405.47 : 139,934.04 = 56,080.81 : x
2. Step 2: Convert to fraction form
   101,405.47/139,934.04 = 56,080.81/x
3. Step 3: Cross multiply
   101,405.47x = 139,934.04 × 56,080.81
4. Step 4: Simplify right side
   101,405.47x = 7,847,613,610.10
5. Step 5: Solve for x
   x = 7,847,613,610.10/101,405.47
6. Step 6: Final answer
   x = 77,388.46