Finding the Fourth Proportional to 141,415, 212,111.40 and 82,212.88

Step by Step Solution

1. Step 1: Write the proportion equation
   141,415 : 212,111.40 = 82,212.88 : x
2. Step 2: Convert to fraction form
   141,415/212,111.40 = 82,212.88/x
3. Step 3: Cross multiply
   141,415x = 212,111.40 × 82,212.88
4. Step 4: Simplify right side
   141,415x = 17,438,289,074.83
5. Step 5: Solve for x
   x = 17,438,289,074.83/141,415
6. Step 6: Final answer
   x = 123,312.87