Finding the Fourth Proportional to 450,345.72, 621,449.10 and 249,141.72

Step by Step Solution

1. Step 1: Write the proportion equation
   450,345.72 : 621,449.10 = 249,141.72 : x
2. Step 2: Convert to fraction form
   450,345.72/621,449.10 = 249,141.72/x
3. Step 3: Cross multiply
   450,345.72x = 621,449.10 × 249,141.72
4. Step 4: Simplify right side
   450,345.72x = 154,828,897,666.45
5. Step 5: Solve for x
   x = 154,828,897,666.45/450,345.72
6. Step 6: Final answer
   x = 343,800.09