Finding the Fourth Proportional to 90,722.64, 136,178.51 and 88,687.27

Step by Step Solution

1. Step 1: Write the proportion equation
   90,722.64 : 136,178.51 = 88,687.27 : x
2. Step 2: Convert to fraction form
   90,722.64/136,178.51 = 88,687.27/x
3. Step 3: Cross multiply
   90,722.64x = 136,178.51 × 88,687.27
4. Step 4: Simplify right side
   90,722.64x = 12,077,300,011.35
5. Step 5: Solve for x
   x = 12,077,300,011.35/90,722.64
6. Step 6: Final answer
   x = 133,123.33