Finding the Fourth Proportional to 21,066.08, 31,462.39 and 19,087.79

Step by Step Solution

1. Step 1: Write the proportion equation
   21,066.08 : 31,462.39 = 19,087.79 : x
2. Step 2: Convert to fraction form
   21,066.08/31,462.39 = 19,087.79/x
3. Step 3: Cross multiply
   21,066.08x = 31,462.39 × 19,087.79
4. Step 4: Simplify right side
   21,066.08x = 600,547,359.77
5. Step 5: Solve for x
   x = 600,547,359.77/21,066.08
6. Step 6: Final answer
   x = 28,507.80