Finding the Fourth Proportional to 12,619.90, 18,905.58 and 7,056.37

Step by Step Solution

1. Step 1: Write the proportion equation
   12,619.90 : 18,905.58 = 7,056.37 : x
2. Step 2: Convert to fraction form
   12,619.90/18,905.58 = 7,056.37/x
3. Step 3: Cross multiply
   12,619.90x = 18,905.58 × 7,056.37
4. Step 4: Simplify right side
   12,619.90x = 133,404,673.02
5. Step 5: Solve for x
   x = 133,404,673.02/12,619.90
6. Step 6: Final answer
   x = 10,570.98