Finding the Fourth Proportional to 1,058.95, 1,580.69 and 980.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,058.95 : 1,580.69 = 980.78 : x
2. Step 2: Convert to fraction form
   1,058.95/1,580.69 = 980.78/x
3. Step 3: Cross multiply
   1,058.95x = 1,580.69 × 980.78
4. Step 4: Simplify right side
   1,058.95x = 1,550,300.78
5. Step 5: Solve for x
   x = 1,550,300.78/1,058.95
6. Step 6: Final answer
   x = 1,464.00