Finding the Fourth Proportional to 1,722.31, 2,376.83 and 1,058.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,722.31 : 2,376.83 = 1,058.78 : x
2. Step 2: Convert to fraction form
   1,722.31/2,376.83 = 1,058.78/x
3. Step 3: Cross multiply
   1,722.31x = 2,376.83 × 1,058.78
4. Step 4: Simplify right side
   1,722.31x = 2,516,548.66
5. Step 5: Solve for x
   x = 2,516,548.66/1,722.31
6. Step 6: Final answer
   x = 1,461.15