Finding the Fourth Proportional to 1,100.51, 1,516.89 and 781.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.51 : 1,516.89 = 781.05 : x
2. Step 2: Convert to fraction form
   1,100.51/1,516.89 = 781.05/x
3. Step 3: Cross multiply
   1,100.51x = 1,516.89 × 781.05
4. Step 4: Simplify right side
   1,100.51x = 1,184,766.93
5. Step 5: Solve for x
   x = 1,184,766.93/1,100.51
6. Step 6: Final answer
   x = 1,076.56