Finding the Fourth Proportional to 154,499.30, 216,921.10 and 154,499.30

Step by Step Solution

1. Step 1: Write the proportion equation
   154,499.30 : 216,921.10 = 154,499.30 : x
2. Step 2: Convert to fraction form
   154,499.30/216,921.10 = 154,499.30/x
3. Step 3: Cross multiply
   154,499.30x = 216,921.10 × 154,499.30
4. Step 4: Simplify right side
   154,499.30x = 33,514,158,105.23
5. Step 5: Solve for x
   x = 33,514,158,105.23/154,499.30
6. Step 6: Final answer
   x = 216,921.10