Finding the Fourth Proportional to 42,801.47, 64,217.36 and 19,106.81

Step by Step Solution

1. Step 1: Write the proportion equation
   42,801.47 : 64,217.36 = 19,106.81 : x
2. Step 2: Convert to fraction form
   42,801.47/64,217.36 = 19,106.81/x
3. Step 3: Cross multiply
   42,801.47x = 64,217.36 × 19,106.81
4. Step 4: Simplify right side
   42,801.47x = 1,226,988,896.22
5. Step 5: Solve for x
   x = 1,226,988,896.22/42,801.47
6. Step 6: Final answer
   x = 28,666.98