Finding the Fourth Proportional to 78,399.39, 117,592.14 and 28,479.91

Step by Step Solution

1. Step 1: Write the proportion equation
   78,399.39 : 117,592.14 = 28,479.91 : x
2. Step 2: Convert to fraction form
   78,399.39/117,592.14 = 28,479.91/x
3. Step 3: Cross multiply
   78,399.39x = 117,592.14 × 28,479.91
4. Step 4: Simplify right side
   78,399.39x = 3,349,013,563.91
5. Step 5: Solve for x
   x = 3,349,013,563.91/78,399.39
6. Step 6: Final answer
   x = 42,717.34