Finding the Fourth Proportional to 14,978.70, 20,931.30 and 14,978.70

Step by Step Solution

1. Step 1: Write the proportion equation
   14,978.70 : 20,931.30 = 14,978.70 : x
2. Step 2: Convert to fraction form
   14,978.70/20,931.30 = 14,978.70/x
3. Step 3: Cross multiply
   14,978.70x = 20,931.30 × 14,978.70
4. Step 4: Simplify right side
   14,978.70x = 313,523,663.31
5. Step 5: Solve for x
   x = 313,523,663.31/14,978.70
6. Step 6: Final answer
   x = 20,931.30