Finding the Fourth Proportional to 1,071.87, 1,607.03 and 724.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.87 : 1,607.03 = 724.34 : x
2. Step 2: Convert to fraction form
   1,071.87/1,607.03 = 724.34/x
3. Step 3: Cross multiply
   1,071.87x = 1,607.03 × 724.34
4. Step 4: Simplify right side
   1,071.87x = 1,164,041.94
5. Step 5: Solve for x
   x = 1,164,041.94/1,071.87
6. Step 6: Final answer
   x = 1,085.99