Finding the Fourth Proportional to 139,731,332.46, 209,328,366.72 and 78,133,665.54

Step by Step Solution

1. Step 1: Write the proportion equation
   139,731,332.46 : 209,328,366.72 = 78,133,665.54 : x
2. Step 2: Convert to fraction form
   139,731,332.46/209,328,366.72 = 78,133,665.54/x
3. Step 3: Cross multiply
   139,731,332.46x = 209,328,366.72 × 78,133,665.54
4. Step 4: Simplify right side
   139,731,332.46x = 16,355,592,593,334,948
5. Step 5: Solve for x
   x = 16,355,592,593,334,948/139,731,332.46
6. Step 6: Final answer
   x = 117,050,287.19