Finding the Fourth Proportional to 1,370.47, 1,891.25 and 781.01

Step by Step Solution

1. Step 1: Write the proportion equation
   1,370.47 : 1,891.25 = 781.01 : x
2. Step 2: Convert to fraction form
   1,370.47/1,891.25 = 781.01/x
3. Step 3: Cross multiply
   1,370.47x = 1,891.25 × 781.01
4. Step 4: Simplify right side
   1,370.47x = 1,477,081.82
5. Step 5: Solve for x
   x = 1,477,081.82/1,370.47
6. Step 6: Final answer
   x = 1,077.79