Finding the Fourth Proportional to 90,654.72, 135,932.16 and 31,485.60

Step by Step Solution

1. Step 1: Write the proportion equation
   90,654.72 : 135,932.16 = 31,485.60 : x
2. Step 2: Convert to fraction form
   90,654.72/135,932.16 = 31,485.60/x
3. Step 3: Cross multiply
   90,654.72x = 135,932.16 × 31,485.60
4. Step 4: Simplify right side
   90,654.72x = 4,279,905,616.90
5. Step 5: Solve for x
   x = 4,279,905,616.90/90,654.72
6. Step 6: Final answer
   x = 47,211.06