Finding the Fourth Proportional to 78,002.56, 107,643.22 and 42,192.66

Step by Step Solution

1. Step 1: Write the proportion equation
   78,002.56 : 107,643.22 = 42,192.66 : x
2. Step 2: Convert to fraction form
   78,002.56/107,643.22 = 42,192.66/x
3. Step 3: Cross multiply
   78,002.56x = 107,643.22 × 42,192.66
4. Step 4: Simplify right side
   78,002.56x = 4,541,753,782.77
5. Step 5: Solve for x
   x = 4,541,753,782.77/78,002.56
6. Step 6: Final answer
   x = 58,225.70