Finding the Fourth Proportional to 78,738.61, 118,155.71 and 31,990.27

Step by Step Solution

1. Step 1: Write the proportion equation
   78,738.61 : 118,155.71 = 31,990.27 : x
2. Step 2: Convert to fraction form
   78,738.61/118,155.71 = 31,990.27/x
3. Step 3: Cross multiply
   78,738.61x = 118,155.71 × 31,990.27
4. Step 4: Simplify right side
   78,738.61x = 3,779,833,064.94
5. Step 5: Solve for x
   x = 3,779,833,064.94/78,738.61
6. Step 6: Final answer
   x = 48,004.82