Finding the Fourth Proportional to 1,043.51, 1,438.31 and 781.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,043.51 : 1,438.31 = 781.07 : x
2. Step 2: Convert to fraction form
   1,043.51/1,438.31 = 781.07/x
3. Step 3: Cross multiply
   1,043.51x = 1,438.31 × 781.07
4. Step 4: Simplify right side
   1,043.51x = 1,123,415.55
5. Step 5: Solve for x
   x = 1,123,415.55/1,043.51
6. Step 6: Final answer
   x = 1,076.58