Finding the Fourth Proportional to 1,431.48, 1,973.88 and 1,038.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,431.48 : 1,973.88 = 1,038.72 : x
2. Step 2: Convert to fraction form
   1,431.48/1,973.88 = 1,038.72/x
3. Step 3: Cross multiply
   1,431.48x = 1,973.88 × 1,038.72
4. Step 4: Simplify right side
   1,431.48x = 2,050,308.63
5. Step 5: Solve for x
   x = 2,050,308.63/1,431.48
6. Step 6: Final answer
   x = 1,432.30