Finding the Fourth Proportional to 1,663.37, 2,491.86 and 930.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,663.37 : 2,491.86 = 930.72 : x
2. Step 2: Convert to fraction form
   1,663.37/2,491.86 = 930.72/x
3. Step 3: Cross multiply
   1,663.37x = 2,491.86 × 930.72
4. Step 4: Simplify right side
   1,663.37x = 2,319,219.29
5. Step 5: Solve for x
   x = 2,319,219.29/1,663.37
6. Step 6: Final answer
   x = 1,394.29