Finding the Fourth Proportional to 78,990.30, 109,008.71 and 47,177.55

Step by Step Solution

1. Step 1: Write the proportion equation
   78,990.30 : 109,008.71 = 47,177.55 : x
2. Step 2: Convert to fraction form
   78,990.30/109,008.71 = 47,177.55/x
3. Step 3: Cross multiply
   78,990.30x = 109,008.71 × 47,177.55
4. Step 4: Simplify right side
   78,990.30x = 5,142,763,630.57
5. Step 5: Solve for x
   x = 5,142,763,630.57/78,990.30
6. Step 6: Final answer
   x = 65,106.27