Finding the Fourth Proportional to 148,846, 205,410.72 and 81,778

Step by Step Solution

1. Step 1: Write the proportion equation
   148,846 : 205,410.72 = 81,778 : x
2. Step 2: Convert to fraction form
   148,846/205,410.72 = 81,778/x
3. Step 3: Cross multiply
   148,846x = 205,410.72 × 81,778
4. Step 4: Simplify right side
   148,846x = 16,798,077,860.16
5. Step 5: Solve for x
   x = 16,798,077,860.16/148,846
6. Step 6: Final answer
   x = 112,855.42