Finding the Fourth Proportional to 28,078,909.50, 42,113,037.69 and 13,687,503.42

Step by Step Solution

1. Step 1: Write the proportion equation
   28,078,909.50 : 42,113,037.69 = 13,687,503.42 : x
2. Step 2: Convert to fraction form
   28,078,909.50/42,113,037.69 = 13,687,503.42/x
3. Step 3: Cross multiply
   28,078,909.50x = 42,113,037.69 × 13,687,503.42
4. Step 4: Simplify right side
   28,078,909.50x = 576,422,347,408,463.88
5. Step 5: Solve for x
   x = 576,422,347,408,463.88/28,078,909.50
6. Step 6: Final answer
   x = 20,528,658.62