Finding the Fourth Proportional to 1,428.89, 1,972.69 and 1,114.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.89 : 1,972.69 = 1,114.88 : x
2. Step 2: Convert to fraction form
   1,428.89/1,972.69 = 1,114.88/x
3. Step 3: Cross multiply
   1,428.89x = 1,972.69 × 1,114.88
4. Step 4: Simplify right side
   1,428.89x = 2,199,299.98
5. Step 5: Solve for x
   x = 2,199,299.98/1,428.89
6. Step 6: Final answer
   x = 1,539.17