Finding the Fourth Proportional to 209,158.64, 288,638.89 and 113,665.33

Step by Step Solution

1. Step 1: Write the proportion equation
   209,158.64 : 288,638.89 = 113,665.33 : x
2. Step 2: Convert to fraction form
   209,158.64/288,638.89 = 113,665.33/x
3. Step 3: Cross multiply
   209,158.64x = 288,638.89 × 113,665.33
4. Step 4: Simplify right side
   209,158.64x = 32,808,232,671.16
5. Step 5: Solve for x
   x = 32,808,232,671.16/209,158.64
6. Step 6: Final answer
   x = 156,858.13