Finding the Fourth Proportional to 138,978.56, 191,789.60 and 75,316.32

Step by Step Solution

1. Step 1: Write the proportion equation
   138,978.56 : 191,789.60 = 75,316.32 : x
2. Step 2: Convert to fraction form
   138,978.56/191,789.60 = 75,316.32/x
3. Step 3: Cross multiply
   138,978.56x = 191,789.60 × 75,316.32
4. Step 4: Simplify right side
   138,978.56x = 14,444,886,886.27
5. Step 5: Solve for x
   x = 14,444,886,886.27/138,978.56
6. Step 6: Final answer
   x = 103,936.08