Finding the Fourth Proportional to 56,238.72, 77,513.60 and 51,471.76

Step by Step Solution

1. Step 1: Write the proportion equation
   56,238.72 : 77,513.60 = 51,471.76 : x
2. Step 2: Convert to fraction form
   56,238.72/77,513.60 = 51,471.76/x
3. Step 3: Cross multiply
   56,238.72x = 77,513.60 × 51,471.76
4. Step 4: Simplify right side
   56,238.72x = 3,989,761,415.94
5. Step 5: Solve for x
   x = 3,989,761,415.94/56,238.72
6. Step 6: Final answer
   x = 70,943.32