Finding the Fourth Proportional to 21,206.61, 31,790.43 and 7,345.89

Step by Step Solution

1. Step 1: Write the proportion equation
   21,206.61 : 31,790.43 = 7,345.89 : x
2. Step 2: Convert to fraction form
   21,206.61/31,790.43 = 7,345.89/x
3. Step 3: Cross multiply
   21,206.61x = 31,790.43 × 7,345.89
4. Step 4: Simplify right side
   21,206.61x = 233,529,001.83
5. Step 5: Solve for x
   x = 233,529,001.83/21,206.61
6. Step 6: Final answer
   x = 11,012.09