Finding the Fourth Proportional to 90,865.89, 136,320.98 and 31,702.05

Step by Step Solution

1. Step 1: Write the proportion equation
   90,865.89 : 136,320.98 = 31,702.05 : x
2. Step 2: Convert to fraction form
   90,865.89/136,320.98 = 31,702.05/x
3. Step 3: Cross multiply
   90,865.89x = 136,320.98 × 31,702.05
4. Step 4: Simplify right side
   90,865.89x = 4,321,654,365.50
5. Step 5: Solve for x
   x = 4,321,654,365.50/90,865.89
6. Step 6: Final answer
   x = 47,560.80