Finding the Fourth Proportional to 13,638.78, 18,820.71 and 7,588.86

Step by Step Solution

1. Step 1: Write the proportion equation
   13,638.78 : 18,820.71 = 7,588.86 : x
2. Step 2: Convert to fraction form
   13,638.78/18,820.71 = 7,588.86/x
3. Step 3: Cross multiply
   13,638.78x = 18,820.71 × 7,588.86
4. Step 4: Simplify right side
   13,638.78x = 142,827,733.29
5. Step 5: Solve for x
   x = 142,827,733.29/13,638.78
6. Step 6: Final answer
   x = 10,472.18