Finding the Fourth Proportional to 1,688.61, 2,328.72 and 1,158.26

Step by Step Solution

1. Step 1: Write the proportion equation
   1,688.61 : 2,328.72 = 1,158.26 : x
2. Step 2: Convert to fraction form
   1,688.61/2,328.72 = 1,158.26/x
3. Step 3: Cross multiply
   1,688.61x = 2,328.72 × 1,158.26
4. Step 4: Simplify right side
   1,688.61x = 2,697,263.23
5. Step 5: Solve for x
   x = 2,697,263.23/1,688.61
6. Step 6: Final answer
   x = 1,597.33