Finding the Fourth Proportional to 1,406.31, 2,109.52 and 528.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,406.31 : 2,109.52 = 528.72 : x
2. Step 2: Convert to fraction form
   1,406.31/2,109.52 = 528.72/x
3. Step 3: Cross multiply
   1,406.31x = 2,109.52 × 528.72
4. Step 4: Simplify right side
   1,406.31x = 1,115,345.41
5. Step 5: Solve for x
   x = 1,115,345.41/1,406.31
6. Step 6: Final answer
   x = 793.10