Finding the Fourth Proportional to 1,398.50, 2,087.12 and 1,342.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,398.50 : 2,087.12 = 1,342.00 : x
2. Step 2: Convert to fraction form
   1,398.50/2,087.12 = 1,342.00/x
3. Step 3: Cross multiply
   1,398.50x = 2,087.12 × 1,342.00
4. Step 4: Simplify right side
   1,398.50x = 2,800,913.18
5. Step 5: Solve for x
   x = 2,800,913.18/1,398.50
6. Step 6: Final answer
   x = 2,002.79