Finding the Fourth Proportional to 28,156.56, 42,237.12 and 7,380

Step by Step Solution

1. Step 1: Write the proportion equation
   28,156.56 : 42,237.12 = 7,380 : x
2. Step 2: Convert to fraction form
   28,156.56/42,237.12 = 7,380/x
3. Step 3: Cross multiply
   28,156.56x = 42,237.12 × 7,380
4. Step 4: Simplify right side
   28,156.56x = 311,709,945.60
5. Step 5: Solve for x
   x = 311,709,945.60/28,156.56
6. Step 6: Final answer
   x = 11,070.60