Finding the Fourth Proportional to 1,470.06, 2,028.78 and 840.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,470.06 : 2,028.78 = 840.45 : x
2. Step 2: Convert to fraction form
   1,470.06/2,028.78 = 840.45/x
3. Step 3: Cross multiply
   1,470.06x = 2,028.78 × 840.45
4. Step 4: Simplify right side
   1,470.06x = 1,705,088.15
5. Step 5: Solve for x
   x = 1,705,088.15/1,470.06
6. Step 6: Final answer
   x = 1,159.88