Finding the Fourth Proportional to 1,407.51, 2,108.70 and 790.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,407.51 : 2,108.70 = 790.29 : x
2. Step 2: Convert to fraction form
   1,407.51/2,108.70 = 790.29/x
3. Step 3: Cross multiply
   1,407.51x = 2,108.70 × 790.29
4. Step 4: Simplify right side
   1,407.51x = 1,666,484.52
5. Step 5: Solve for x
   x = 1,666,484.52/1,407.51
6. Step 6: Final answer
   x = 1,183.99