Finding the Fourth Proportional to 1,420.06, 1,959.72 and 790.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,420.06 : 1,959.72 = 790.60 : x
2. Step 2: Convert to fraction form
   1,420.06/1,959.72 = 790.60/x
3. Step 3: Cross multiply
   1,420.06x = 1,959.72 × 790.60
4. Step 4: Simplify right side
   1,420.06x = 1,549,354.63
5. Step 5: Solve for x
   x = 1,549,354.63/1,420.06
6. Step 6: Final answer
   x = 1,091.05