Finding the Fourth Proportional to 1,429.48, 1,972.65 and 840.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.48 : 1,972.65 = 840.03 : x
2. Step 2: Convert to fraction form
   1,429.48/1,972.65 = 840.03/x
3. Step 3: Cross multiply
   1,429.48x = 1,972.65 × 840.03
4. Step 4: Simplify right side
   1,429.48x = 1,657,085.18
5. Step 5: Solve for x
   x = 1,657,085.18/1,429.48
6. Step 6: Final answer
   x = 1,159.22