Finding the Fourth Proportional to 1,428.59, 1,969.76 and 1,113.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,428.59 : 1,969.76 = 1,113.50 : x
2. Step 2: Convert to fraction form
   1,428.59/1,969.76 = 1,113.50/x
3. Step 3: Cross multiply
   1,428.59x = 1,969.76 × 1,113.50
4. Step 4: Simplify right side
   1,428.59x = 2,193,312.34
5. Step 5: Solve for x
   x = 2,193,312.34/1,428.59
6. Step 6: Final answer
   x = 1,535.30