Finding the Fourth Proportional to 91,417.96, 136,519.43 and 90,428.34

Step by Step Solution

1. Step 1: Write the proportion equation
   91,417.96 : 136,519.43 = 90,428.34 : x
2. Step 2: Convert to fraction form
   91,417.96/136,519.43 = 90,428.34/x
3. Step 3: Cross multiply
   91,417.96x = 136,519.43 × 90,428.34
4. Step 4: Simplify right side
   91,417.96x = 12,345,225,319.61
5. Step 5: Solve for x
   x = 12,345,225,319.61/91,417.96
6. Step 6: Final answer
   x = 135,041.58