Finding the Fourth Proportional to 102,660, 141,670.80 and 55,556

Step by Step Solution

1. Step 1: Write the proportion equation
   102,660 : 141,670.80 = 55,556 : x
2. Step 2: Convert to fraction form
   102,660/141,670.80 = 55,556/x
3. Step 3: Cross multiply
   102,660x = 141,670.80 × 55,556
4. Step 4: Simplify right side
   102,660x = 7,870,662,964.80
5. Step 5: Solve for x
   x = 7,870,662,964.80/102,660
6. Step 6: Final answer
   x = 76,667.28