Finding the Fourth Proportional to 128,405,443.63, 192,567,705.87 and 42,123,744.67

Step by Step Solution

1. Step 1: Write the proportion equation
   128,405,443.63 : 192,567,705.87 = 42,123,744.67 : x
2. Step 2: Convert to fraction form
   128,405,443.63/192,567,705.87 = 42,123,744.67/x
3. Step 3: Cross multiply
   128,405,443.63x = 192,567,705.87 × 42,123,744.67
4. Step 4: Simplify right side
   128,405,443.63x = 8,111,672,873,755,541
5. Step 5: Solve for x
   x = 8,111,672,873,755,541/128,405,443.63
6. Step 6: Final answer
   x = 63,172,344.13