Finding the Fourth Proportional to 1,663.84, 2,488.38 and 1,077.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,663.84 : 2,488.38 = 1,077.40 : x
2. Step 2: Convert to fraction form
   1,663.84/2,488.38 = 1,077.40/x
3. Step 3: Cross multiply
   1,663.84x = 2,488.38 × 1,077.40
4. Step 4: Simplify right side
   1,663.84x = 2,680,980.61
5. Step 5: Solve for x
   x = 2,680,980.61/1,663.84
6. Step 6: Final answer
   x = 1,611.32