Finding the Fourth Proportional to 190,978.88, 286,318.56 and 120,710.72

Step by Step Solution

1. Step 1: Write the proportion equation
   190,978.88 : 286,318.56 = 120,710.72 : x
2. Step 2: Convert to fraction form
   190,978.88/286,318.56 = 120,710.72/x
3. Step 3: Cross multiply
   190,978.88x = 286,318.56 × 120,710.72
4. Step 4: Simplify right side
   190,978.88x = 34,561,719,526.96
5. Step 5: Solve for x
   x = 34,561,719,526.96/190,978.88
6. Step 6: Final answer
   x = 180,971.42