Finding the Fourth Proportional to 91,426.68, 136,532.43 and 90,437.00

Step by Step Solution

1. Step 1: Write the proportion equation
   91,426.68 : 136,532.43 = 90,437.00 : x
2. Step 2: Convert to fraction form
   91,426.68/136,532.43 = 90,437.00/x
3. Step 3: Cross multiply
   91,426.68x = 136,532.43 × 90,437.00
4. Step 4: Simplify right side
   91,426.68x = 12,347,582,689.25
5. Step 5: Solve for x
   x = 12,347,582,689.25/91,426.68
6. Step 6: Final answer
   x = 135,054.48