Finding the Fourth Proportional to 149,128.83, 205,791.59 and 81,146.07

Step by Step Solution

1. Step 1: Write the proportion equation
   149,128.83 : 205,791.59 = 81,146.07 : x
2. Step 2: Convert to fraction form
   149,128.83/205,791.59 = 81,146.07/x
3. Step 3: Cross multiply
   149,128.83x = 205,791.59 × 81,146.07
4. Step 4: Simplify right side
   149,128.83x = 16,699,178,970.42
5. Step 5: Solve for x
   x = 16,699,178,970.42/149,128.83
6. Step 6: Final answer
   x = 111,978.21