Finding the Fourth Proportional to 28,360.02, 42,562.71 and 12,778.86

Step by Step Solution

1. Step 1: Write the proportion equation
   28,360.02 : 42,562.71 = 12,778.86 : x
2. Step 2: Convert to fraction form
   28,360.02/42,562.71 = 12,778.86/x
3. Step 3: Cross multiply
   28,360.02x = 42,562.71 × 12,778.86
4. Step 4: Simplify right side
   28,360.02x = 543,902,912.31
5. Step 5: Solve for x
   x = 543,902,912.31/28,360.02
6. Step 6: Final answer
   x = 19,178.51