Finding the Fourth Proportional to 139,025.57, 208,539.41 and 91,034.58

Step by Step Solution

1. Step 1: Write the proportion equation
   139,025.57 : 208,539.41 = 91,034.58 : x
2. Step 2: Convert to fraction form
   139,025.57/208,539.41 = 91,034.58/x
3. Step 3: Cross multiply
   139,025.57x = 208,539.41 × 91,034.58
4. Step 4: Simplify right side
   139,025.57x = 18,984,298,441.72
5. Step 5: Solve for x
   x = 18,984,298,441.72/139,025.57
6. Step 6: Final answer
   x = 136,552.57