Finding the Fourth Proportional to 1,663.86, 2,500.35 and 1,555.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,663.86 : 2,500.35 = 1,555.50 : x
2. Step 2: Convert to fraction form
   1,663.86/2,500.35 = 1,555.50/x
3. Step 3: Cross multiply
   1,663.86x = 2,500.35 × 1,555.50
4. Step 4: Simplify right side
   1,663.86x = 3,889,294.43
5. Step 5: Solve for x
   x = 3,889,294.43/1,663.86
6. Step 6: Final answer
   x = 2,337.51