Finding the Fourth Proportional to 12,784.89, 19,151.81 and 10,156.85

Step by Step Solution

1. Step 1: Write the proportion equation
   12,784.89 : 19,151.81 = 10,156.85 : x
2. Step 2: Convert to fraction form
   12,784.89/19,151.81 = 10,156.85/x
3. Step 3: Cross multiply
   12,784.89x = 19,151.81 × 10,156.85
4. Step 4: Simplify right side
   12,784.89x = 194,522,061.40
5. Step 5: Solve for x
   x = 194,522,061.40/12,784.89
6. Step 6: Final answer
   x = 15,215.00