Finding the Fourth Proportional to 256,243,412.72, 384,430,663.47 and 74,490,590.72

Step by Step Solution

1. Step 1: Write the proportion equation
   256,243,412.72 : 384,430,663.47 = 74,490,590.72 : x
2. Step 2: Convert to fraction form
   256,243,412.72/384,430,663.47 = 74,490,590.72/x
3. Step 3: Cross multiply
   256,243,412.72x = 384,430,663.47 × 74,490,590.72
4. Step 4: Simplify right side
   256,243,412.72x = 28,636,467,210,839,676
5. Step 5: Solve for x
   x = 28,636,467,210,839,676/256,243,412.72
6. Step 6: Final answer
   x = 111,754,939.99