Finding the Fourth Proportional to 113,181.52, 156,199.80 and 72,978.97

Step by Step Solution

1. Step 1: Write the proportion equation
   113,181.52 : 156,199.80 = 72,978.97 : x
2. Step 2: Convert to fraction form
   113,181.52/156,199.80 = 72,978.97/x
3. Step 3: Cross multiply
   113,181.52x = 156,199.80 × 72,978.97
4. Step 4: Simplify right side
   113,181.52x = 11,399,300,518.21
5. Step 5: Solve for x
   x = 11,399,300,518.21/113,181.52
6. Step 6: Final answer
   x = 100,716.98