Finding the Fourth Proportional to 1,388.48, 1,915.68 and 973.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,388.48 : 1,915.68 = 973.76 : x
2. Step 2: Convert to fraction form
   1,388.48/1,915.68 = 973.76/x
3. Step 3: Cross multiply
   1,388.48x = 1,915.68 × 973.76
4. Step 4: Simplify right side
   1,388.48x = 1,865,412.56
5. Step 5: Solve for x
   x = 1,865,412.56/1,388.48
6. Step 6: Final answer
   x = 1,343.49