Finding the Fourth Proportional to 12,590.69, 18,875.07 and 7,385.63

Step by Step Solution

1. Step 1: Write the proportion equation
   12,590.69 : 18,875.07 = 7,385.63 : x
2. Step 2: Convert to fraction form
   12,590.69/18,875.07 = 7,385.63/x
3. Step 3: Cross multiply
   12,590.69x = 18,875.07 × 7,385.63
4. Step 4: Simplify right side
   12,590.69x = 139,404,188.87
5. Step 5: Solve for x
   x = 139,404,188.87/12,590.69
6. Step 6: Final answer
   x = 11,072.01