Finding the Fourth Proportional to 1,358.56, 1,875.72 and 916.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,358.56 : 1,875.72 = 916.30 : x
2. Step 2: Convert to fraction form
   1,358.56/1,875.72 = 916.30/x
3. Step 3: Cross multiply
   1,358.56x = 1,875.72 × 916.30
4. Step 4: Simplify right side
   1,358.56x = 1,718,722.24
5. Step 5: Solve for x
   x = 1,718,722.24/1,358.56
6. Step 6: Final answer
   x = 1,265.11