Finding the Fourth Proportional to 90,498.22, 135,012.50 and 85,599.34

Step by Step Solution

1. Step 1: Write the proportion equation
   90,498.22 : 135,012.50 = 85,599.34 : x
2. Step 2: Convert to fraction form
   90,498.22/135,012.50 = 85,599.34/x
3. Step 3: Cross multiply
   90,498.22x = 135,012.50 × 85,599.34
4. Step 4: Simplify right side
   90,498.22x = 11,556,980,891.75
5. Step 5: Solve for x
   x = 11,556,980,891.75/90,498.22
6. Step 6: Final answer
   x = 127,703.96