Finding the Fourth Proportional to 1,425.34, 2,136.30 and 931.99

Step by Step Solution

1. Step 1: Write the proportion equation
   1,425.34 : 2,136.30 = 931.99 : x
2. Step 2: Convert to fraction form
   1,425.34/2,136.30 = 931.99/x
3. Step 3: Cross multiply
   1,425.34x = 2,136.30 × 931.99
4. Step 4: Simplify right side
   1,425.34x = 1,991,002.95
5. Step 5: Solve for x
   x = 1,991,002.95/1,425.34
6. Step 6: Final answer
   x = 1,396.86