Finding the Fourth Proportional to 42,300.90, 63,446.55 and 11,138.58

Step by Step Solution

1. Step 1: Write the proportion equation
   42,300.90 : 63,446.55 = 11,138.58 : x
2. Step 2: Convert to fraction form
   42,300.90/63,446.55 = 11,138.58/x
3. Step 3: Cross multiply
   42,300.90x = 63,446.55 × 11,138.58
4. Step 4: Simplify right side
   42,300.90x = 706,704,472.90
5. Step 5: Solve for x
   x = 706,704,472.90/42,300.90
6. Step 6: Final answer
   x = 16,706.61