Finding the Fourth Proportional to 1,368.72, 1,887.54 and 1,089.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,368.72 : 1,887.54 = 1,089.87 : x
2. Step 2: Convert to fraction form
   1,368.72/1,887.54 = 1,089.87/x
3. Step 3: Cross multiply
   1,368.72x = 1,887.54 × 1,089.87
4. Step 4: Simplify right side
   1,368.72x = 2,057,173.22
5. Step 5: Solve for x
   x = 2,057,173.22/1,368.72
6. Step 6: Final answer
   x = 1,502.99