Finding the Fourth Proportional to 42,724.32, 64,095.66 and 13,141.50

Step by Step Solution

1. Step 1: Write the proportion equation
   42,724.32 : 64,095.66 = 13,141.50 : x
2. Step 2: Convert to fraction form
   42,724.32/64,095.66 = 13,141.50/x
3. Step 3: Cross multiply
   42,724.32x = 64,095.66 × 13,141.50
4. Step 4: Simplify right side
   42,724.32x = 842,313,115.89
5. Step 5: Solve for x
   x = 842,313,115.89/42,724.32
6. Step 6: Final answer
   x = 19,715.07