Finding the Fourth Proportional to 28,388.93, 42,590.06 and 8,667.50

Step by Step Solution

1. Step 1: Write the proportion equation
   28,388.93 : 42,590.06 = 8,667.50 : x
2. Step 2: Convert to fraction form
   28,388.93/42,590.06 = 8,667.50/x
3. Step 3: Cross multiply
   28,388.93x = 42,590.06 × 8,667.50
4. Step 4: Simplify right side
   28,388.93x = 369,149,088.76
5. Step 5: Solve for x
   x = 369,149,088.76/28,388.93
6. Step 6: Final answer
   x = 13,003.28