Finding the Fourth Proportional to 78,543.89, 117,739.69 and 31,143.50

Step by Step Solution

1. Step 1: Write the proportion equation
   78,543.89 : 117,739.69 = 31,143.50 : x
2. Step 2: Convert to fraction form
   78,543.89/117,739.69 = 31,143.50/x
3. Step 3: Cross multiply
   78,543.89x = 117,739.69 × 31,143.50
4. Step 4: Simplify right side
   78,543.89x = 3,666,826,035.52
5. Step 5: Solve for x
   x = 3,666,826,035.52/78,543.89
6. Step 6: Final answer
   x = 46,685.06