Finding the Fourth Proportional to 152,156,925.78, 209,868,311.82 and 139,638,405.68

Step by Step Solution

1. Step 1: Write the proportion equation
   152,156,925.78 : 209,868,311.82 = 139,638,405.68 : x
2. Step 2: Convert to fraction form
   152,156,925.78/209,868,311.82 = 139,638,405.68/x
3. Step 3: Cross multiply
   152,156,925.78x = 209,868,311.82 × 139,638,405.68
4. Step 4: Simplify right side
   152,156,925.78x = 29,305,676,465,297,900
5. Step 5: Solve for x
   x = 29,305,676,465,297,900/152,156,925.78
6. Step 6: Final answer
   x = 192,601,659.87