Finding the Fourth Proportional to 120,390,000.69, 166,139,051.33 and 65,385,857.19

Step by Step Solution

1. Step 1: Write the proportion equation
   120,390,000.69 : 166,139,051.33 = 65,385,857.19 : x
2. Step 2: Convert to fraction form
   120,390,000.69/166,139,051.33 = 65,385,857.19/x
3. Step 3: Cross multiply
   120,390,000.69x = 166,139,051.33 × 65,385,857.19
4. Step 4: Simplify right side
   120,390,000.69x = 10,863,144,283,945,460
5. Step 5: Solve for x
   x = 10,863,144,283,945,460/120,390,000.69
6. Step 6: Final answer
   x = 90,232,944.78