Finding the Fourth Proportional to 1,061.02, 1,590.63 and 402.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.02 : 1,590.63 = 402.53 : x
2. Step 2: Convert to fraction form
   1,061.02/1,590.63 = 402.53/x
3. Step 3: Cross multiply
   1,061.02x = 1,590.63 × 402.53
4. Step 4: Simplify right side
   1,061.02x = 640,280.00
5. Step 5: Solve for x
   x = 640,280.00/1,061.02
6. Step 6: Final answer
   x = 603.45