Finding the Fourth Proportional to 77,139.56, 106,421.18 and 50,272.28

Step by Step Solution

1. Step 1: Write the proportion equation
   77,139.56 : 106,421.18 = 50,272.28 : x
2. Step 2: Convert to fraction form
   77,139.56/106,421.18 = 50,272.28/x
3. Step 3: Cross multiply
   77,139.56x = 106,421.18 × 50,272.28
4. Step 4: Simplify right side
   77,139.56x = 5,350,035,358.89
5. Step 5: Solve for x
   x = 5,350,035,358.89/77,139.56
6. Step 6: Final answer
   x = 69,355.27