Finding the Fourth Proportional to 128,862,620.72, 177,830,445.60 and 70,915,868.72

Step by Step Solution

1. Step 1: Write the proportion equation
   128,862,620.72 : 177,830,445.60 = 70,915,868.72 : x
2. Step 2: Convert to fraction form
   128,862,620.72/177,830,445.60 = 70,915,868.72/x
3. Step 3: Cross multiply
   128,862,620.72x = 177,830,445.60 × 70,915,868.72
4. Step 4: Simplify right side
   128,862,620.72x = 12,611,000,534,588,700
5. Step 5: Solve for x
   x = 12,611,000,534,588,700/128,862,620.72
6. Step 6: Final answer
   x = 97,863,914.80