Finding the Fourth Proportional to 1,688.72, 2,530.30 and 1,038.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,688.72 : 2,530.30 = 1,038.08 : x
2. Step 2: Convert to fraction form
   1,688.72/2,530.30 = 1,038.08/x
3. Step 3: Cross multiply
   1,688.72x = 2,530.30 × 1,038.08
4. Step 4: Simplify right side
   1,688.72x = 2,626,653.82
5. Step 5: Solve for x
   x = 2,626,653.82/1,688.72
6. Step 6: Final answer
   x = 1,555.41