Finding the Fourth Proportional to 78,978.80, 108,990.47 and 43,168.79

Step by Step Solution

1. Step 1: Write the proportion equation
   78,978.80 : 108,990.47 = 43,168.79 : x
2. Step 2: Convert to fraction form
   78,978.80/108,990.47 = 43,168.79/x
3. Step 3: Cross multiply
   78,978.80x = 108,990.47 × 43,168.79
4. Step 4: Simplify right side
   78,978.80x = 4,704,985,950.64
5. Step 5: Solve for x
   x = 4,704,985,950.64/78,978.80
6. Step 6: Final answer
   x = 59,572.77