Finding the Fourth Proportional to 43,003.42, 64,479.89 and 13,008.65

Step by Step Solution

1. Step 1: Write the proportion equation
   43,003.42 : 64,479.89 = 13,008.65 : x
2. Step 2: Convert to fraction form
   43,003.42/64,479.89 = 13,008.65/x
3. Step 3: Cross multiply
   43,003.42x = 64,479.89 × 13,008.65
4. Step 4: Simplify right side
   43,003.42x = 838,796,031.17
5. Step 5: Solve for x
   x = 838,796,031.17/43,003.42
6. Step 6: Final answer
   x = 19,505.33