Finding the Fourth Proportional to 78,681.68, 118,071.72 and 31,934.55

Step by Step Solution

1. Step 1: Write the proportion equation
   78,681.68 : 118,071.72 = 31,934.55 : x
2. Step 2: Convert to fraction form
   78,681.68/118,071.72 = 31,934.55/x
3. Step 3: Cross multiply
   78,681.68x = 118,071.72 × 31,934.55
4. Step 4: Simplify right side
   78,681.68x = 3,770,567,245.93
5. Step 5: Solve for x
   x = 3,770,567,245.93/78,681.68
6. Step 6: Final answer
   x = 47,921.79