Finding the Fourth Proportional to 139,083.68, 208,454.51 and 64,099.76

Step by Step Solution

1. Step 1: Write the proportion equation
   139,083.68 : 208,454.51 = 64,099.76 : x
2. Step 2: Convert to fraction form
   139,083.68/208,454.51 = 64,099.76/x
3. Step 3: Cross multiply
   139,083.68x = 208,454.51 × 64,099.76
4. Step 4: Simplify right side
   139,083.68x = 13,361,883,179.89
5. Step 5: Solve for x
   x = 13,361,883,179.89/139,083.68
6. Step 6: Final answer
   x = 96,070.82