Finding the Fourth Proportional to 28,333.79, 42,499.80 and 7,272.98

Step by Step Solution

1. Step 1: Write the proportion equation
   28,333.79 : 42,499.80 = 7,272.98 : x
2. Step 2: Convert to fraction form
   28,333.79/42,499.80 = 7,272.98/x
3. Step 3: Cross multiply
   28,333.79x = 42,499.80 × 7,272.98
4. Step 4: Simplify right side
   28,333.79x = 309,099,982.91
5. Step 5: Solve for x
   x = 309,099,982.91/28,333.79
6. Step 6: Final answer
   x = 10,909.24