Finding the Fourth Proportional to 289,857,111.90, 434,636,733.15 and 85,358,615.10

Step by Step Solution

1. Step 1: Write the proportion equation
   289,857,111.90 : 434,636,733.15 = 85,358,615.10 : x
2. Step 2: Convert to fraction form
   289,857,111.90/434,636,733.15 = 85,358,615.10/x
3. Step 3: Cross multiply
   289,857,111.90x = 434,636,733.15 × 85,358,615.10
4. Step 4: Simplify right side
   289,857,111.90x = 37,099,989,613,272,256
5. Step 5: Solve for x
   x = 37,099,989,613,272,256/289,857,111.90
6. Step 6: Final answer
   x = 127,994,063.59