Finding the Fourth Proportional to 42,889.76, 64,331.55 and 13,306.82

Step by Step Solution

1. Step 1: Write the proportion equation
   42,889.76 : 64,331.55 = 13,306.82 : x
2. Step 2: Convert to fraction form
   42,889.76/64,331.55 = 13,306.82/x
3. Step 3: Cross multiply
   42,889.76x = 64,331.55 × 13,306.82
4. Step 4: Simplify right side
   42,889.76x = 856,048,356.17
5. Step 5: Solve for x
   x = 856,048,356.17/42,889.76
6. Step 6: Final answer
   x = 19,959.27