Finding the Fourth Proportional to 91,917.91, 137,453.59 and 87,433.87

Step by Step Solution

1. Step 1: Write the proportion equation
   91,917.91 : 137,453.59 = 87,433.87 : x
2. Step 2: Convert to fraction form
   91,917.91/137,453.59 = 87,433.87/x
3. Step 3: Cross multiply
   91,917.91x = 137,453.59 × 87,433.87
4. Step 4: Simplify right side
   91,917.91x = 12,018,099,319.09
5. Step 5: Solve for x
   x = 12,018,099,319.09/91,917.91
6. Step 6: Final answer
   x = 130,748.18