Finding the Fourth Proportional to 1,435.68, 2,152.56 and 947.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,435.68 : 2,152.56 = 947.28 : x
2. Step 2: Convert to fraction form
   1,435.68/2,152.56 = 947.28/x
3. Step 3: Cross multiply
   1,435.68x = 2,152.56 × 947.28
4. Step 4: Simplify right side
   1,435.68x = 2,039,077.04
5. Step 5: Solve for x
   x = 2,039,077.04/1,435.68
6. Step 6: Final answer
   x = 1,420.29