Finding the Fourth Proportional to 42,920.56, 64,393.26 and 17,947.72

Step by Step Solution

1. Step 1: Write the proportion equation
   42,920.56 : 64,393.26 = 17,947.72 : x
2. Step 2: Convert to fraction form
   42,920.56/64,393.26 = 17,947.72/x
3. Step 3: Cross multiply
   42,920.56x = 64,393.26 × 17,947.72
4. Step 4: Simplify right side
   42,920.56x = 1,155,712,200.37
5. Step 5: Solve for x
   x = 1,155,712,200.37/42,920.56
6. Step 6: Final answer
   x = 26,926.77