Finding the Fourth Proportional to 91,588.86, 138,112.02 and 90,339.84

Step by Step Solution

1. Step 1: Write the proportion equation
   91,588.86 : 138,112.02 = 90,339.84 : x
2. Step 2: Convert to fraction form
   91,588.86/138,112.02 = 90,339.84/x
3. Step 3: Cross multiply
   91,588.86x = 138,112.02 × 90,339.84
4. Step 4: Simplify right side
   91,588.86x = 12,477,017,788.88
5. Step 5: Solve for x
   x = 12,477,017,788.88/91,588.86
6. Step 6: Final answer
   x = 136,228.55