Finding the Fourth Proportional to 56,425.86, 78,224.18 and 53,429.76

Step by Step Solution

1. Step 1: Write the proportion equation
   56,425.86 : 78,224.18 = 53,429.76 : x
2. Step 2: Convert to fraction form
   56,425.86/78,224.18 = 53,429.76/x
3. Step 3: Cross multiply
   56,425.86x = 78,224.18 × 53,429.76
4. Step 4: Simplify right side
   56,425.86x = 4,179,498,896.45
5. Step 5: Solve for x
   x = 4,179,498,896.45/56,425.86
6. Step 6: Final answer
   x = 74,070.63