Finding the Fourth Proportional to 42,731.56, 64,120.29 and 17,788.83

Step by Step Solution

1. Step 1: Write the proportion equation
   42,731.56 : 64,120.29 = 17,788.83 : x
2. Step 2: Convert to fraction form
   42,731.56/64,120.29 = 17,788.83/x
3. Step 3: Cross multiply
   42,731.56x = 64,120.29 × 17,788.83
4. Step 4: Simplify right side
   42,731.56x = 1,140,624,938.36
5. Step 5: Solve for x
   x = 1,140,624,938.36/42,731.56
6. Step 6: Final answer
   x = 26,692.80