Finding the Fourth Proportional to 101,439.16, 139,978.50 and 56,117.68

Step by Step Solution

1. Step 1: Write the proportion equation
   101,439.16 : 139,978.50 = 56,117.68 : x
2. Step 2: Convert to fraction form
   101,439.16/139,978.50 = 56,117.68/x
3. Step 3: Cross multiply
   101,439.16x = 139,978.50 × 56,117.68
4. Step 4: Simplify right side
   101,439.16x = 7,855,268,669.88
5. Step 5: Solve for x
   x = 7,855,268,669.88/101,439.16
6. Step 6: Final answer
   x = 77,438.23