Finding the Fourth Proportional to 1,376.91, 2,061.68 and 1,158.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,376.91 : 2,061.68 = 1,158.21 : x
2. Step 2: Convert to fraction form
   1,376.91/2,061.68 = 1,158.21/x
3. Step 3: Cross multiply
   1,376.91x = 2,061.68 × 1,158.21
4. Step 4: Simplify right side
   1,376.91x = 2,387,852.60
5. Step 5: Solve for x
   x = 2,387,852.60/1,376.91
6. Step 6: Final answer
   x = 1,734.21