Finding the Fourth Proportional to 145,870, 201,300.78 and 78,802

Step by Step Solution

1. Step 1: Write the proportion equation
   145,870 : 201,300.78 = 78,802 : x
2. Step 2: Convert to fraction form
   145,870/201,300.78 = 78,802/x
3. Step 3: Cross multiply
   145,870x = 201,300.78 × 78,802
4. Step 4: Simplify right side
   145,870x = 15,862,904,065.56
5. Step 5: Solve for x
   x = 15,862,904,065.56/145,870
6. Step 6: Final answer
   x = 108,746.86