Finding the Fourth Proportional to 2,102.39, 2,901.18 and 1,158.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,102.39 : 2,901.18 = 1,158.15 : x
2. Step 2: Convert to fraction form
   2,102.39/2,901.18 = 1,158.15/x
3. Step 3: Cross multiply
   2,102.39x = 2,901.18 × 1,158.15
4. Step 4: Simplify right side
   2,102.39x = 3,360,001.62
5. Step 5: Solve for x
   x = 3,360,001.62/2,102.39
6. Step 6: Final answer
   x = 1,598.18