Finding the Fourth Proportional to 1,370.69, 1,890.90 and 997.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,370.69 : 1,890.90 = 997.50 : x
2. Step 2: Convert to fraction form
   1,370.69/1,890.90 = 997.50/x
3. Step 3: Cross multiply
   1,370.69x = 1,890.90 × 997.50
4. Step 4: Simplify right side
   1,370.69x = 1,886,172.75
5. Step 5: Solve for x
   x = 1,886,172.75/1,370.69
6. Step 6: Final answer
   x = 1,376.08