Finding the Fourth Proportional to 89,158.16, 133,735.88 and 21,690.70

Step by Step Solution

1. Step 1: Write the proportion equation
   89,158.16 : 133,735.88 = 21,690.70 : x
2. Step 2: Convert to fraction form
   89,158.16/133,735.88 = 21,690.70/x
3. Step 3: Cross multiply
   89,158.16x = 133,735.88 × 21,690.70
4. Step 4: Simplify right side
   89,158.16x = 2,900,824,852.32
5. Step 5: Solve for x
   x = 2,900,824,852.32/89,158.16
6. Step 6: Final answer
   x = 32,535.72