Finding the Fourth Proportional to 157,196.30, 216,450.50 and 118,490.31

Step by Step Solution

1. Step 1: Write the proportion equation
   157,196.30 : 216,450.50 = 118,490.31 : x
2. Step 2: Convert to fraction form
   157,196.30/216,450.50 = 118,490.31/x
3. Step 3: Cross multiply
   157,196.30x = 216,450.50 × 118,490.31
4. Step 4: Simplify right side
   157,196.30x = 25,647,286,252.20
5. Step 5: Solve for x
   x = 25,647,286,252.20/157,196.30
6. Step 6: Final answer
   x = 163,154.52