Finding the Fourth Proportional to 42,808.19, 64,215.32 and 13,222.19

Step by Step Solution

1. Step 1: Write the proportion equation
   42,808.19 : 64,215.32 = 13,222.19 : x
2. Step 2: Convert to fraction form
   42,808.19/64,215.32 = 13,222.19/x
3. Step 3: Cross multiply
   42,808.19x = 64,215.32 × 13,222.19
4. Step 4: Simplify right side
   42,808.19x = 849,067,256.38
5. Step 5: Solve for x
   x = 849,067,256.38/42,808.19
6. Step 6: Final answer
   x = 19,834.23