Finding the Fourth Proportional to 139,353.89, 209,035.16 and 66,307.83

Step by Step Solution

1. Step 1: Write the proportion equation
   139,353.89 : 209,035.16 = 66,307.83 : x
2. Step 2: Convert to fraction form
   139,353.89/209,035.16 = 66,307.83/x
3. Step 3: Cross multiply
   139,353.89x = 209,035.16 × 66,307.83
4. Step 4: Simplify right side
   139,353.89x = 13,860,667,521.76
5. Step 5: Solve for x
   x = 13,860,667,521.76/139,353.89
6. Step 6: Final answer
   x = 99,463.80