Finding the Fourth Proportional to 1,526.31, 2,105.06 and 1,290.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,526.31 : 2,105.06 = 1,290.83 : x
2. Step 2: Convert to fraction form
   1,526.31/2,105.06 = 1,290.83/x
3. Step 3: Cross multiply
   1,526.31x = 2,105.06 × 1,290.83
4. Step 4: Simplify right side
   1,526.31x = 2,717,257.62
5. Step 5: Solve for x
   x = 2,717,257.62/1,526.31
6. Step 6: Final answer
   x = 1,780.28