Finding the Fourth Proportional to 1,663.02, 2,294.15 and 999.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,663.02 : 2,294.15 = 999.72 : x
2. Step 2: Convert to fraction form
   1,663.02/2,294.15 = 999.72/x
3. Step 3: Cross multiply
   1,663.02x = 2,294.15 × 999.72
4. Step 4: Simplify right side
   1,663.02x = 2,293,502.64
5. Step 5: Solve for x
   x = 2,293,502.64/1,663.02
6. Step 6: Final answer
   x = 1,379.12