Finding the Fourth Proportional to 1,428.41, 1,971.86 and 1,038.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.41 : 1,971.86 = 1,038.39 : x
2. Step 2: Convert to fraction form
   1,428.41/1,971.86 = 1,038.39/x
3. Step 3: Cross multiply
   1,428.41x = 1,971.86 × 1,038.39
4. Step 4: Simplify right side
   1,428.41x = 2,047,554.51
5. Step 5: Solve for x
   x = 2,047,554.51/1,428.41
6. Step 6: Final answer
   x = 1,433.46