Finding the Fourth Proportional to 90,644.52, 135,985.98 and 28,319.72

Step by Step Solution

1. Step 1: Write the proportion equation
   90,644.52 : 135,985.98 = 28,319.72 : x
2. Step 2: Convert to fraction form
   90,644.52/135,985.98 = 28,319.72/x
3. Step 3: Cross multiply
   90,644.52x = 135,985.98 × 28,319.72
4. Step 4: Simplify right side
   90,644.52x = 3,851,084,877.53
5. Step 5: Solve for x
   x = 3,851,084,877.53/90,644.52
6. Step 6: Final answer
   x = 42,485.58