Finding the Fourth Proportional to 12,056.47, 18,070.73 and 7,130.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,056.47 : 18,070.73 = 7,130.25 : x
2. Step 2: Convert to fraction form
   12,056.47/18,070.73 = 7,130.25/x
3. Step 3: Cross multiply
   12,056.47x = 18,070.73 × 7,130.25
4. Step 4: Simplify right side
   12,056.47x = 128,848,894.57
5. Step 5: Solve for x
   x = 128,848,894.57/12,056.47
6. Step 6: Final answer
   x = 10,687.12