Finding the Fourth Proportional to 12,870.60, 17,762.12 and 7,834.02

Step by Step Solution

1. Step 1: Write the proportion equation
   12,870.60 : 17,762.12 = 7,834.02 : x
2. Step 2: Convert to fraction form
   12,870.60/17,762.12 = 7,834.02/x
3. Step 3: Cross multiply
   12,870.60x = 17,762.12 × 7,834.02
4. Step 4: Simplify right side
   12,870.60x = 139,148,803.32
5. Step 5: Solve for x
   x = 139,148,803.32/12,870.60
6. Step 6: Final answer
   x = 10,811.37