Finding the Fourth Proportional to 42,850.53, 64,260.72 and 12,855.81

Step by Step Solution

1. Step 1: Write the proportion equation
   42,850.53 : 64,260.72 = 12,855.81 : x
2. Step 2: Convert to fraction form
   42,850.53/64,260.72 = 12,855.81/x
3. Step 3: Cross multiply
   42,850.53x = 64,260.72 × 12,855.81
4. Step 4: Simplify right side
   42,850.53x = 826,123,606.78
5. Step 5: Solve for x
   x = 826,123,606.78/42,850.53
6. Step 6: Final answer
   x = 19,279.19