Finding the Fourth Proportional to 43,019.33, 64,526.70 and 13,433.78

Step by Step Solution

1. Step 1: Write the proportion equation
   43,019.33 : 64,526.70 = 13,433.78 : x
2. Step 2: Convert to fraction form
   43,019.33/64,526.70 = 13,433.78/x
3. Step 3: Cross multiply
   43,019.33x = 64,526.70 × 13,433.78
4. Step 4: Simplify right side
   43,019.33x = 866,837,491.93
5. Step 5: Solve for x
   x = 866,837,491.93/43,019.33
6. Step 6: Final answer
   x = 20,149.95