Finding the Fourth Proportional to 1,430.33, 1,973.70 and 840.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,430.33 : 1,973.70 = 840.83 : x
2. Step 2: Convert to fraction form
   1,430.33/1,973.70 = 840.83/x
3. Step 3: Cross multiply
   1,430.33x = 1,973.70 × 840.83
4. Step 4: Simplify right side
   1,430.33x = 1,659,536.30
5. Step 5: Solve for x
   x = 1,659,536.30/1,430.33
6. Step 6: Final answer
   x = 1,160.25