Finding the Fourth Proportional to 28,503, 42,743.52 and 11,870.88

Step by Step Solution

1. Step 1: Write the proportion equation
   28,503 : 42,743.52 = 11,870.88 : x
2. Step 2: Convert to fraction form
   28,503/42,743.52 = 11,870.88/x
3. Step 3: Cross multiply
   28,503x = 42,743.52 × 11,870.88
4. Step 4: Simplify right side
   28,503x = 507,403,196.70
5. Step 5: Solve for x
   x = 507,403,196.70/28,503
6. Step 6: Final answer
   x = 17,801.75