Finding the Fourth Proportional to 148,978.78, 205,389.49 and 101,149.10

Step by Step Solution

1. Step 1: Write the proportion equation
   148,978.78 : 205,389.49 = 101,149.10 : x
2. Step 2: Convert to fraction form
   148,978.78/205,389.49 = 101,149.10/x
3. Step 3: Cross multiply
   148,978.78x = 205,389.49 × 101,149.10
4. Step 4: Simplify right side
   148,978.78x = 20,774,962,062.96
5. Step 5: Solve for x
   x = 20,774,962,062.96/148,978.78
6. Step 6: Final answer
   x = 139,449.14