Finding the Fourth Proportional to 13,978.81, 19,291.29 and 8,011.63

Step by Step Solution

1. Step 1: Write the proportion equation
   13,978.81 : 19,291.29 = 8,011.63 : x
2. Step 2: Convert to fraction form
   13,978.81/19,291.29 = 8,011.63/x
3. Step 3: Cross multiply
   13,978.81x = 19,291.29 × 8,011.63
4. Step 4: Simplify right side
   13,978.81x = 154,554,617.52
5. Step 5: Solve for x
   x = 154,554,617.52/13,978.81
6. Step 6: Final answer
   x = 11,056.35