Finding the Fourth Proportional to 19,356, 28,978.92 and 12,762.06

Step by Step Solution

1. Step 1: Write the proportion equation
   19,356 : 28,978.92 = 12,762.06 : x
2. Step 2: Convert to fraction form
   19,356/28,978.92 = 12,762.06/x
3. Step 3: Cross multiply
   19,356x = 28,978.92 × 12,762.06
4. Step 4: Simplify right side
   19,356x = 369,830,715.78
5. Step 5: Solve for x
   x = 369,830,715.78/19,356
6. Step 6: Final answer
   x = 19,106.77