Finding the Fourth Proportional to 1,030.58, 1,422.33 and 781.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,030.58 : 1,422.33 = 781.51 : x
2. Step 2: Convert to fraction form
   1,030.58/1,422.33 = 781.51/x
3. Step 3: Cross multiply
   1,030.58x = 1,422.33 × 781.51
4. Step 4: Simplify right side
   1,030.58x = 1,111,565.12
5. Step 5: Solve for x
   x = 1,111,565.12/1,030.58
6. Step 6: Final answer
   x = 1,078.58