Finding the Fourth Proportional to 1,059.72, 1,587.70 and 904.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,059.72 : 1,587.70 = 904.07 : x
2. Step 2: Convert to fraction form
   1,059.72/1,587.70 = 904.07/x
3. Step 3: Cross multiply
   1,059.72x = 1,587.70 × 904.07
4. Step 4: Simplify right side
   1,059.72x = 1,435,387.69
5. Step 5: Solve for x
   x = 1,435,387.69/1,059.72
6. Step 6: Final answer
   x = 1,354.50