Finding the Fourth Proportional to 12,970.64, 17,900.52 and 9,972.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,970.64 : 17,900.52 = 9,972.56 : x
2. Step 2: Convert to fraction form
   12,970.64/17,900.52 = 9,972.56/x
3. Step 3: Cross multiply
   12,970.64x = 17,900.52 × 9,972.56
4. Step 4: Simplify right side
   12,970.64x = 178,514,009.73
5. Step 5: Solve for x
   x = 178,514,009.73/12,970.64
6. Step 6: Final answer
   x = 13,762.93