Finding the Fourth Proportional to 109,160,648.78, 163,243,632.89 and 81,513,980.79

Step by Step Solution

1. Step 1: Write the proportion equation
   109,160,648.78 : 163,243,632.89 = 81,513,980.79 : x
2. Step 2: Convert to fraction form
   109,160,648.78/163,243,632.89 = 81,513,980.79/x
3. Step 3: Cross multiply
   109,160,648.78x = 163,243,632.89 × 81,513,980.79
4. Step 4: Simplify right side
   109,160,648.78x = 13,306,638,355,995,304
5. Step 5: Solve for x
   x = 13,306,638,355,995,304/109,160,648.78
6. Step 6: Final answer
   x = 121,899,590.23