Finding the Fourth Proportional to 28,111.08, 42,178.27 and 12,307.95

Step by Step Solution

1. Step 1: Write the proportion equation
   28,111.08 : 42,178.27 = 12,307.95 : x
2. Step 2: Convert to fraction form
   28,111.08/42,178.27 = 12,307.95/x
3. Step 3: Cross multiply
   28,111.08x = 42,178.27 × 12,307.95
4. Step 4: Simplify right side
   28,111.08x = 519,128,030.55
5. Step 5: Solve for x
   x = 519,128,030.55/28,111.08
6. Step 6: Final answer
   x = 18,467.03