Finding the Fourth Proportional to 90,605.91, 135,298.68 and 73,998.89

Step by Step Solution

1. Step 1: Write the proportion equation
   90,605.91 : 135,298.68 = 73,998.89 : x
2. Step 2: Convert to fraction form
   90,605.91/135,298.68 = 73,998.89/x
3. Step 3: Cross multiply
   90,605.91x = 135,298.68 × 73,998.89
4. Step 4: Simplify right side
   90,605.91x = 10,011,952,138.47
5. Step 5: Solve for x
   x = 10,011,952,138.47/90,605.91
6. Step 6: Final answer
   x = 110,499.99