Finding the Fourth Proportional to 1,061.34, 1,590.40 and 540.57

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.34 : 1,590.40 = 540.57 : x
2. Step 2: Convert to fraction form
   1,061.34/1,590.40 = 540.57/x
3. Step 3: Cross multiply
   1,061.34x = 1,590.40 × 540.57
4. Step 4: Simplify right side
   1,061.34x = 859,722.53
5. Step 5: Solve for x
   x = 859,722.53/1,061.34
6. Step 6: Final answer
   x = 810.03