Finding the Fourth Proportional to 51,139.77, 76,742.67 and 21,557.76

Step by Step Solution

1. Step 1: Write the proportion equation
   51,139.77 : 76,742.67 = 21,557.76 : x
2. Step 2: Convert to fraction form
   51,139.77/76,742.67 = 21,557.76/x
3. Step 3: Cross multiply
   51,139.77x = 76,742.67 × 21,557.76
4. Step 4: Simplify right side
   51,139.77x = 1,654,400,061.62
5. Step 5: Solve for x
   x = 1,654,400,061.62/51,139.77
6. Step 6: Final answer
   x = 32,350.56