Finding the Fourth Proportional to 91,591.86, 138,116.55 and 90,342.84

Step by Step Solution

1. Step 1: Write the proportion equation
   91,591.86 : 138,116.55 = 90,342.84 : x
2. Step 2: Convert to fraction form
   91,591.86/138,116.55 = 90,342.84/x
3. Step 3: Cross multiply
   91,591.86x = 138,116.55 × 90,342.84
4. Step 4: Simplify right side
   91,591.86x = 12,477,841,378.00
5. Step 5: Solve for x
   x = 12,477,841,378.00/91,591.86
6. Step 6: Final answer
   x = 136,233.08