Finding the Fourth Proportional to 78,023.52, 107,672.16 and 42,213.60

Step by Step Solution

1. Step 1: Write the proportion equation
   78,023.52 : 107,672.16 = 42,213.60 : x
2. Step 2: Convert to fraction form
   78,023.52/107,672.16 = 42,213.60/x
3. Step 3: Cross multiply
   78,023.52x = 107,672.16 × 42,213.60
4. Step 4: Simplify right side
   78,023.52x = 4,545,229,493.38
5. Step 5: Solve for x
   x = 4,545,229,493.38/78,023.52
6. Step 6: Final answer
   x = 58,254.61