Finding the Fourth Proportional to 56,620.64, 78,124.56 and 31,469.60

Step by Step Solution

1. Step 1: Write the proportion equation
   56,620.64 : 78,124.56 = 31,469.60 : x
2. Step 2: Convert to fraction form
   56,620.64/78,124.56 = 31,469.60/x
3. Step 3: Cross multiply
   56,620.64x = 78,124.56 × 31,469.60
4. Step 4: Simplify right side
   56,620.64x = 2,458,548,653.38
5. Step 5: Solve for x
   x = 2,458,548,653.38/56,620.64
6. Step 6: Final answer
   x = 43,421.42