Finding the Fourth Proportional to 28,056.98, 42,071.40 and 9,330.42

Step by Step Solution

1. Step 1: Write the proportion equation
   28,056.98 : 42,071.40 = 9,330.42 : x
2. Step 2: Convert to fraction form
   28,056.98/42,071.40 = 9,330.42/x
3. Step 3: Cross multiply
   28,056.98x = 42,071.40 × 9,330.42
4. Step 4: Simplify right side
   28,056.98x = 392,543,989.76
5. Step 5: Solve for x
   x = 392,543,989.76/28,056.98
6. Step 6: Final answer
   x = 13,990.96