Finding the Fourth Proportional to 21,987.30, 32,953.86 and 12,507.57

Step by Step Solution

1. Step 1: Write the proportion equation
   21,987.30 : 32,953.86 = 12,507.57 : x
2. Step 2: Convert to fraction form
   21,987.30/32,953.86 = 12,507.57/x
3. Step 3: Cross multiply
   21,987.30x = 32,953.86 × 12,507.57
4. Step 4: Simplify right side
   21,987.30x = 412,172,710.72
5. Step 5: Solve for x
   x = 412,172,710.72/21,987.30
6. Step 6: Final answer
   x = 18,745.94