Finding the Fourth Proportional to 78,146.88, 117,225.72 and 31,399.77

Step by Step Solution

1. Step 1: Write the proportion equation
   78,146.88 : 117,225.72 = 31,399.77 : x
2. Step 2: Convert to fraction form
   78,146.88/117,225.72 = 31,399.77/x
3. Step 3: Cross multiply
   78,146.88x = 117,225.72 × 31,399.77
4. Step 4: Simplify right side
   78,146.88x = 3,680,860,646.08
5. Step 5: Solve for x
   x = 3,680,860,646.08/78,146.88
6. Step 6: Final answer
   x = 47,101.82