Finding the Fourth Proportional to 28,307.79, 42,462.63 and 12,725.46

Step by Step Solution

1. Step 1: Write the proportion equation
   28,307.79 : 42,462.63 = 12,725.46 : x
2. Step 2: Convert to fraction form
   28,307.79/42,462.63 = 12,725.46/x
3. Step 3: Cross multiply
   28,307.79x = 42,462.63 × 12,725.46
4. Step 4: Simplify right side
   28,307.79x = 540,356,499.56
5. Step 5: Solve for x
   x = 540,356,499.56/28,307.79
6. Step 6: Final answer
   x = 19,088.61