Finding the Fourth Proportional to 21,498.34, 29,670.51 and 12,066.91

Step by Step Solution

1. Step 1: Write the proportion equation
   21,498.34 : 29,670.51 = 12,066.91 : x
2. Step 2: Convert to fraction form
   21,498.34/29,670.51 = 12,066.91/x
3. Step 3: Cross multiply
   21,498.34x = 29,670.51 × 12,066.91
4. Step 4: Simplify right side
   21,498.34x = 358,031,373.82
5. Step 5: Solve for x
   x = 358,031,373.82/21,498.34
6. Step 6: Final answer
   x = 16,653.91