Finding the Fourth Proportional to 1,558.61, 2,335.87 and 1,393.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,558.61 : 2,335.87 = 1,393.10 : x
2. Step 2: Convert to fraction form
   1,558.61/2,335.87 = 1,393.10/x
3. Step 3: Cross multiply
   1,558.61x = 2,335.87 × 1,393.10
4. Step 4: Simplify right side
   1,558.61x = 3,254,099.32
5. Step 5: Solve for x
   x = 3,254,099.32/1,558.61
6. Step 6: Final answer
   x = 2,087.82